Simplify FunctionDecl::AddRedeclaration a bit by using std::swap.
Fix 'swapping' of attributes to not insert null values into the 
DeclAttrs map.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@50612 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed